The mandibles are usually lost, the labrum is reduced to a narrow transverse sclerite, and the labium is a small flap ( though its palps retain quite large).
颚消
，
退化为
条窄横
，
退化为小（须发达）。
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In an anatomical female, that involves the vulva, which includes the mons pubis over the pubic bone, and labia majora and labia minora — the elongated skin folds that surround the vestibule, which contains both the urethral and vaginal openings.
解剖
女性中，这涉及外阴，包
耻骨上的耻骨，大阴和小阴——
周围的细长皮肤褶皱，包尿道口和阴道口。
